/mandos/trunk : revision 451

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@recompile.se>.

29

* Contact the authors at <mandos@fukt.bsnet.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno,

66

program_invocation_short_name */

65

#include <errno.h> /* perror(), errno */

67

66

#include <time.h> /* nanosleep(), time(), sleep() */

68

67

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

69

68

SIOCSIFFLAGS, if_indextoname(),

74

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

75

74

getuid(), getgid(), seteuid(),

76

75

setgid(), pause() */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

78

77

#include <iso646.h> /* not, or, and */

79

78

#include <argp.h> /* struct argp_option, error_t, struct

80

79

argp_state, struct argp,

123

122

#define PATHDIR "/conf/conf.d/mandos"

124

123

#define SECKEY "seckey.txt"

125

124

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

127

125

128

126

bool debug = false;

129

127

static const char mandos_protocol_version[] = "1";

130

128

const char *argp_program_version = "mandos-client " VERSION;

131

const char *argp_program_bug_address = "<mandos@recompile.se>";

129

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

132

130

static const char sys_class_net[] = "/sys/class/net";

133

131

char *connect_to = NULL;

134

132

135

/* Doubly linked list that need to be circularly linked when used */

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

145

146

133

/* Used for passing in values through the Avahi callback functions */

147

134

typedef struct {

148

135

AvahiSimplePoll *simple_poll;

152

139

gnutls_dh_params_t dh_params;

153

140

const char *priority;

154

141

gpgme_ctx_t ctx;

155

server *current_server;

156

142

} mandos_context;

157

143

158

144

/* global context so signal handler can reach it*/

159

145

mandos_context mc = { .simple_poll = NULL, .server = NULL,

160

146

.dh_bits = 1024, .priority = "SECURE256"

161

":!CTYPE-X.509:+CTYPE-OPENPGP",

162

.current_server = NULL };

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

163

148

164

149

sig_atomic_t quit_now = 0;

165

150

int signal_received = 0;

166

151

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

fprintf(stderr, "Mandos plugin %s: ",

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

174

152

/*

175

153

* Make additional room in "buffer" for at least BUFFER_SIZE more

176

154

* bytes. "buffer_capacity" is how much is currently allocated,

188

166

return buffer_capacity;

189

167

}

190

168

191

/* Add server to set of servers to retry periodically */

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

server *new_server = malloc(sizeof(server));

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

*new_server = (server){ .ip = strdup(ip),

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

/* Place the new server last in the list */

215

} else {

216

new_server->next = mc.current_server;

217

new_server->prev = mc.current_server->prev;

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

229

169

/*

230

170

* Initialize GPGME.

231

171

*/

245

185

246

186

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

247

187

if(fd == -1){

248

perror_plus("open");

188

perror("open");

249

189

return false;

250

190

}

251

191

265

205

266

206

ret = (int)TEMP_FAILURE_RETRY(close(fd));

267

207

if(ret == -1){

268

perror_plus("close");

208

perror("close");

269

209

}

270

210

gpgme_data_release(pgp_data);

271

211

return true;

284

224

return false;

285

225

}

286

226

287

/* Set GPGME home directory for the OpenPGP engine only */

227

/* Set GPGME home directory for the OpenPGP engine only */

288

228

rc = gpgme_get_engine_info(&engine_info);

289

229

if(rc != GPG_ERR_NO_ERROR){

290

230

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

396

336

397

337

/* Seek back to the beginning of the GPGME plaintext data buffer */

398

338

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

399

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

400

340

plaintext_length = -1;

401

341

goto decrypt_end;

402

342

}

407

347

(size_t)plaintext_length,

408

348

plaintext_capacity);

409

349

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

350

perror("incbuffer");

411

351

plaintext_length = -1;

412

352

goto decrypt_end;

413

353

}

420

360

break;

421

361

}

422

362

if(ret < 0){

423

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

424

364

plaintext_length = -1;

425

365

goto decrypt_end;

426

366

}

483

423

}

484

424

485

425

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

487

427

if(ret != GNUTLS_E_SUCCESS){

488

fprintf(stderr, "GnuTLS memory error: %s\n",

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

489

432

safer_gnutls_strerror(ret));

490

433

gnutls_global_deinit();

491

434

return -1;

646

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

647

590

if(tcp_sd < 0){

648

591

int e = errno;

649

perror_plus("socket");

592

perror("socket");

650

593

errno = e;

651

594

goto mandos_end;

652

595

}

666

609

}

667

610

if(ret < 0 ){

668

611

int e = errno;

669

perror_plus("inet_pton");

612

perror("inet_pton");

670

613

errno = e;

671

614

goto mandos_end;

672

615

}

708

651

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

709

652

char interface[IF_NAMESIZE];

710

653

if(if_indextoname((unsigned int)if_index, interface) == NULL){

711

perror_plus("if_indextoname");

654

perror("if_indextoname");

712

655

} else {

713

656

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

714

657

ip, interface, port);

728

671

sizeof(addrstr));

729

672

}

730

673

if(pcret == NULL){

731

perror_plus("inet_ntop");

674

perror("inet_ntop");

732

675

} else {

733

676

if(strcmp(addrstr, ip) != 0){

734

677

fprintf(stderr, "Canonical address form: %s\n", addrstr);

749

692

if(ret < 0){

750

693

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

751

694

int e = errno;

752

perror_plus("connect");

695

perror("connect");

753

696

errno = e;

754

697

}

755

698

goto mandos_end;

768

711

out_size - written));

769

712

if(ret == -1){

770

713

int e = errno;

771

perror_plus("write");

714

perror("write");

772

715

errno = e;

773

716

goto mandos_end;

774

717

}

799

742

goto mandos_end;

800

743

}

801

744

802

/* Spurious warning from -Wint-to-pointer-cast */

803

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

804

746

805

747

if(quit_now){

842

784

buffer_capacity);

843

785

if(buffer_capacity == 0){

844

786

int e = errno;

845

perror_plus("incbuffer");

787

perror("incbuffer");

846

788

errno = e;

847

789

goto mandos_end;

848

790

}

953

895

if(e == 0){

954

896

e = errno;

955

897

}

956

perror_plus("close");

898

perror("close");

957

899

}

958

900

gnutls_deinit(session);

959

errno = e;

960

901

if(quit_now){

961

errno = EINTR;

902

e = EINTR;

962

903

retval = -1;

963

904

}

905

errno = e;

964

906

}

965

907

return retval;

966

908

}

1009

951

avahi_proto_to_af(proto));

1010

952

if(ret == 0){

1011

953

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1015

954

}

1016

955

}

1017

956

}

1071

1010

}

1072

1011

}

1073

1012

1074

/* Signal handler that stops main loop after SIGTERM */

1013

/* stop main loop after sigterm has been called */

1075

1014

static void handle_sigterm(int sig){

1076

1015

if(quit_now){

1077

1016

return;

1079

1018

quit_now = 1;

1080

1019

signal_received = sig;

1081

1020

int old_errno = errno;

1082

/* set main loop to exit */

1083

1021

if(mc.simple_poll != NULL){

1084

1022

avahi_simple_poll_quit(mc.simple_poll);

1085

1023

}

1086

1024

errno = old_errno;

1087

1025

}

1088

1026

1089

bool get_flags(const char *ifname, struct ifreq *ifr){

1090

int ret;

1091

1092

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

bool good_flags(const char *ifname, const struct ifreq *ifr){

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1114

ifname);

1115

}

1116

return false;

1117

}

1118

/* Accept point-to-point devices only if connect_to is specified */

1119

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1120

if(debug){

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1122

ifname);

1123

}

1124

return true;

1125

}

1126

/* Otherwise, reject non-broadcast-capable devices */

1127

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1128

if(debug){

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1130

ifname);

1131

}

1132

return false;

1133

}

1134

/* Reject non-ARP interfaces (including dummy interfaces) */

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1145

}

1146

return true;

1147

}

1148

1149

1027

/*

1150

1028

* This function determines if a directory entry in /sys/class/net

1151

1029

* corresponds to an acceptable network device.

1152

1030

* (This function is passed to scandir(3) as a filter function.)

1153

1031

*/

1154

1032

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

if(if_entry->d_name[0] == '.'){

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

if(not get_flags(if_entry->d_name, &ifr)){

1162

return 0;

1163

}

1164

1165

if(not good_flags(if_entry->d_name, &ifr)){

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

* This function determines if a directory entry in /sys/class/net

1173

* corresponds to an acceptable network device which is up.

1174

* (This function is passed to scandir(3) as a filter function.)

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

1033

ssize_t ssret;

1178

1034

char *flagname = NULL;

1179

if(if_entry->d_name[0] == '.'){

1180

return 0;

1181

}

1182

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1183

1036

if_entry->d_name);

1184

1037

if(ret < 0){

1185

perror_plus("asprintf");

1038

perror("asprintf");

1039

return 0;

1040

}

1041

if(if_entry->d_name[0] == '.'){

1186

1042

return 0;

1187

1043

}

1188

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1189

1045

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1046

perror("open");

1192

1047

return 0;

1193

1048

}

1194

free(flagname);

1195

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1196

1050

/* read line from flags_fd */

1197

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1198

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1199

1053

flagstring[(size_t)to_read] = '\0';

1200

1054

if(flagstring == NULL){

1201

perror_plus("malloc");

1055

perror("malloc");

1202

1056

close(flags_fd);

1203

1057

return 0;

1204

1058

}

1206

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1207

1061

(size_t)to_read));

1208

1062

if(ssret == -1){

1209

perror_plus("read");

1063

perror("read");

1210

1064

free(flagstring);

1211

1065

close(flags_fd);

1212

1066

return 0;

1241

1095

}

1242

1096

return 0;

1243

1097

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

1098

/* Accept point-to-point devices only if connect_to is specified */

1251

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1252

1100

if(debug){

1263

1111

}

1264

1112

return 0;

1265

1113

}

1266

/* Reject non-ARP interfaces (including dummy interfaces) */

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

1114

/* Accept this device */

1275

1115

if(debug){

1276

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1279

1119

return 1;

1280

1120

}

1281

1121

1282

int notdotentries(const struct dirent *direntry){

1283

/* Skip "." and ".." */

1284

if(direntry->d_name[0] == '.'

1285

and (direntry->d_name[1] == '\0'

1286

or (direntry->d_name[1] == '.'

1287

and direntry->d_name[2] == '\0'))){

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

/* Is this directory entry a runnable program? */

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

if((direntry->d_name)[0] == '\0'){

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

char *end = strchr(direntry->d_name, '\0')-1;

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

if(((direntry->d_name)[0] == '#')

1312

and (*end == '#')){

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

ret = stat(direntry->d_name, &st);

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

if(not (st.st_mode & S_ISREG)){

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

"Wait until first server is found. No timeout!\n");

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

fprintf(stderr, "Check current_server if we should run it,"

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

/* Calculating in ms how long time between now and server

1362

who we visted longest time ago. Now - last seen. */

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

/* total time is 10s/10,000ms.

1368

Converting to s from ms by dividing by 1,000,

1369

and ns to ms by dividing by 1,000,000. */

1370

block_time = ((retry_interval

1371

- ((intmax_t)waited_time.tv_sec * 1000))

1372

- ((intmax_t)waited_time.tv_nsec / 1000000));

1373

1374

if (debug){

1375

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

block_time = 0; /* Call avahi to find new Mandos

1395

servers, but don't block */

1396

}

1397

1398

ret = avahi_simple_poll_iterate(s, (int)block_time);

1399

}

1400

if(ret != 0){

1401

if (ret > 0 or errno != EINTR) {

1402

return (ret != 1) ? ret : 0;

1403

}

1404

}

1405

}

1406

}

1407

1408

1122

int main(int argc, char *argv[]){

1409

1123

AvahiSServiceBrowser *sb = NULL;

1410

1124

int error;

1427

1141

bool gnutls_initialized = false;

1428

1142

bool gpgme_initialized = false;

1429

1143

float delay = 2.5f;

1430

double retry_interval = 10; /* 10s between trying a server and

1431

retrying the same server again */

1432

1144

1433

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1434

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1440

1152

errno = 0;

1441

1153

ret = setgid(gid);

1442

1154

if(ret == -1){

1443

perror_plus("setgid");

1155

perror("setgid");

1444

1156

}

1445

1157

1446

1158

/* Lower user privileges (temporarily) */

1447

1159

errno = 0;

1448

1160

ret = seteuid(uid);

1449

1161

if(ret == -1){

1450

perror_plus("seteuid");

1162

perror("seteuid");

1451

1163

}

1452

1164

1453

1165

if(quit_now){

1488

1200

.arg = "SECONDS",

1489

1201

.doc = "Maximum delay to wait for interface startup",

1490

1202

.group = 2 },

1491

{ .name = "retry", .key = 132,

1492

.arg = "SECONDS",

1493

.doc = "Retry interval used when denied by the mandos server",

1494

.group = 2 },

1495

1203

/*

1496

1204

* These reproduce what we would get without ARGP_NO_HELP

1497

1205

*/

1541

1249

if(errno != 0 or tmp == arg or *tmp != '\0'){

1542

1250

argp_error(state, "Bad delay");

1543

1251

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

if(errno != 0 or tmp == arg or *tmp != '\0'

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

1551

}

1552

1252

break;

1553

1253

/*

1554

1254

* These reproduce what we would get without ARGP_NO_HELP

1582

1282

case ENOMEM:

1583

1283

default:

1584

1284

errno = ret;

1585

perror_plus("argp_parse");

1285

perror("argp_parse");

1586

1286

exitcode = EX_OSERR;

1587

1287

goto end;

1588

1288

case EINVAL:

1590

1290

goto end;

1591

1291

}

1592

1292

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

<http://bugs.debian.org/633582> */

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1659

alphasort);

1660

int devnull = open("/dev/null", O_RDONLY);

1661

for(int i = 0; i < numhooks; i++){

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

ret = asprintf(&fullname, "%s/%s", tempdir,

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

setenv("VERBOSE", debug ? "1" : "0", 1);

1678

setenv("MODE", "start", 1);

1679

/* setenv( XXX more here */

1680

ret = execl(fullname, direntry->d_name, "start");

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1689

}

1690

1293

1691

1294

if(not debug){

1692

1295

avahi_set_log_function(empty_log);

1693

1296

}

1694

1297

1695

1298

if(interface[0] == '\0'){

1696

1299

struct dirent **direntries;

1697

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1703

1306

fprintf(stderr, "Using interface \"%s\"\n", interface);

1704

1307

}

1705

1308

if(interface == NULL){

1706

perror_plus("malloc");

1309

perror("malloc");

1707

1310

free(direntries);

1708

1311

exitcode = EXIT_FAILURE;

1709

1312

goto end;

1731

1334

sigemptyset(&sigterm_action.sa_mask);

1732

1335

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1733

1336

if(ret == -1){

1734

perror_plus("sigaddset");

1337

perror("sigaddset");

1735

1338

exitcode = EX_OSERR;

1736

1339

goto end;

1737

1340

}

1738

1341

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1739

1342

if(ret == -1){

1740

perror_plus("sigaddset");

1343

perror("sigaddset");

1741

1344

exitcode = EX_OSERR;

1742

1345

goto end;

1743

1346

}

1744

1347

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1745

1348

if(ret == -1){

1746

perror_plus("sigaddset");

1349

perror("sigaddset");

1747

1350

exitcode = EX_OSERR;

1748

1351

goto end;

1749

1352

}

1753

1356

*/

1754

1357

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1755

1358

if(ret == -1){

1756

perror_plus("sigaction");

1359

perror("sigaction");

1757

1360

return EX_OSERR;

1758

1361

}

1759

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1760

1363

ret = sigaction(SIGINT, &sigterm_action, NULL);

1761

1364

if(ret == -1){

1762

perror_plus("sigaction");

1365

perror("sigaction");

1763

1366

exitcode = EX_OSERR;

1764

1367

goto end;

1765

1368

}

1766

1369

}

1767

1370

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1768

1371

if(ret == -1){

1769

perror_plus("sigaction");

1372

perror("sigaction");

1770

1373

return EX_OSERR;

1771

1374

}

1772

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1773

1376

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1774

1377

if(ret == -1){

1775

perror_plus("sigaction");

1378

perror("sigaction");

1776

1379

exitcode = EX_OSERR;

1777

1380

goto end;

1778

1381

}

1779

1382

}

1780

1383

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1781

1384

if(ret == -1){

1782

perror_plus("sigaction");

1385

perror("sigaction");

1783

1386

return EX_OSERR;

1784

1387

}

1785

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1786

1389

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1787

1390

if(ret == -1){

1788

perror_plus("sigaction");

1391

perror("sigaction");

1789

1392

exitcode = EX_OSERR;

1790

1393

goto end;

1791

1394

}

1808

1411

errno = 0;

1809

1412

ret = seteuid(0);

1810

1413

if(ret == -1){

1811

perror_plus("seteuid");

1414

perror("seteuid");

1812

1415

}

1813

1416

1814

1417

#ifdef __linux__

1818

1421

bool restore_loglevel = true;

1819

1422

if(ret == -1){

1820

1423

restore_loglevel = false;

1821

perror_plus("klogctl");

1424

perror("klogctl");

1822

1425

}

1823

1426

#endif /* __linux__ */

1824

1427

1825

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1826

1429

if(sd < 0){

1827

perror_plus("socket");

1430

perror("socket");

1828

1431

exitcode = EX_OSERR;

1829

1432

#ifdef __linux__

1830

1433

if(restore_loglevel){

1831

1434

ret = klogctl(7, NULL, 0);

1832

1435

if(ret == -1){

1833

perror_plus("klogctl");

1436

perror("klogctl");

1834

1437

}

1835

1438

}

1836

1439

#endif /* __linux__ */

1838

1441

errno = 0;

1839

1442

ret = seteuid(uid);

1840

1443

if(ret == -1){

1841

perror_plus("seteuid");

1444

perror("seteuid");

1842

1445

}

1843

1446

goto end;

1844

1447

}

1845

1448

strcpy(network.ifr_name, interface);

1846

1449

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1847

1450

if(ret == -1){

1848

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1849

1452

#ifdef __linux__

1850

1453

if(restore_loglevel){

1851

1454

ret = klogctl(7, NULL, 0);

1852

1455

if(ret == -1){

1853

perror_plus("klogctl");

1456

perror("klogctl");

1854

1457

}

1855

1458

}

1856

1459

#endif /* __linux__ */

1859

1462

errno = 0;

1860

1463

ret = seteuid(uid);

1861

1464

if(ret == -1){

1862

perror_plus("seteuid");

1465

perror("seteuid");

1863

1466

}

1864

1467

goto end;

1865

1468

}

1869

1472

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1870

1473

if(ret == -1){

1871

1474

take_down_interface = false;

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1873

1476

exitcode = EX_OSERR;

1874

1477

#ifdef __linux__

1875

1478

if(restore_loglevel){

1876

1479

ret = klogctl(7, NULL, 0);

1877

1480

if(ret == -1){

1878

perror_plus("klogctl");

1481

perror("klogctl");

1879

1482

}

1880

1483

}

1881

1484

#endif /* __linux__ */

1883

1486

errno = 0;

1884

1487

ret = seteuid(uid);

1885

1488

if(ret == -1){

1886

perror_plus("seteuid");

1489

perror("seteuid");

1887

1490

}

1888

1491

goto end;

1889

1492

}

1890

1493

}

1891

/* Sleep checking until interface is running.

1892

Check every 0.25s, up to total time of delay */

1494

/* sleep checking until interface is running */

1893

1495

for(int i=0; i < delay * 4; i++){

1894

1496

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1895

1497

if(ret == -1){

1896

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1897

1499

} else if(network.ifr_flags & IFF_RUNNING){

1898

1500

break;

1899

1501

}

1900

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1901

1503

ret = nanosleep(&sleeptime, NULL);

1902

1504

if(ret == -1 and errno != EINTR){

1903

perror_plus("nanosleep");

1505

perror("nanosleep");

1904

1506

}

1905

1507

}

1906

1508

if(not take_down_interface){

1907

1509

/* We won't need the socket anymore */

1908

1510

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1909

1511

if(ret == -1){

1910

perror_plus("close");

1512

perror("close");

1911

1513

}

1912

1514

}

1913

1515

#ifdef __linux__

1915

1517

/* Restores kernel loglevel to default */

1916

1518

ret = klogctl(7, NULL, 0);

1917

1519

if(ret == -1){

1918

perror_plus("klogctl");

1520

perror("klogctl");

1919

1521

}

1920

1522

}

1921

1523

#endif /* __linux__ */

1925

1527

/* Lower privileges */

1926

1528

ret = seteuid(uid);

1927

1529

if(ret == -1){

1928

perror_plus("seteuid");

1530

perror("seteuid");

1929

1531

}

1930

1532

} else {

1931

1533

/* Lower privileges permanently */

1932

1534

ret = setuid(uid);

1933

1535

if(ret == -1){

1934

perror_plus("setuid");

1536

perror("setuid");

1935

1537

}

1936

1538

}

1937

1539

}

1953

1555

goto end;

1954

1556

}

1955

1557

1558

tempdir_created = true;

1956

1559

if(mkdtemp(tempdir) == NULL){

1957

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

1958

1562

goto end;

1959

1563

}

1960

tempdir_created = true;

1961

1564

1962

1565

if(quit_now){

1963

1566

goto end;

2005

1608

2006

1609

port = (uint16_t)tmpmax;

2007

1610

*address = '\0';

1611

address = connect_to;

2008

1612

/* Colon in address indicates IPv6 */

2009

1613

int af;

2010

if(strchr(connect_to, ':') != NULL){

1614

if(strchr(address, ':') != NULL){

2011

1615

af = AF_INET6;

2012

/* Accept [] around IPv6 address - see RFC 5952 */

2013

if(connect_to[0] == '[' and address[-1] == ']')

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

2018

1616

} else {

2019

1617

af = AF_INET;

2020

1618

}

2021

address = connect_to;

2022

1619

2023

1620

if(quit_now){

2024

1621

goto end;

2025

1622

}

2026

1623

2027

1624

while(not quit_now){

2028

1625

ret = start_mandos_communication(address, port, if_index, af);

2029

1626

if(quit_now or ret == 0){

2030

1627

break;

2031

1628

}

2032

if(debug){

2033

fprintf(stderr, "Retrying in %d seconds\n",

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

1629

sleep(15);

1630

};

1631

2039

1632

if (not quit_now){

2040

1633

exitcode = EXIT_SUCCESS;

2041

1634

}

2042

1635

2043

1636

goto end;

2044

1637

}

2045

1638

2097

1690

if(debug){

2098

1691

fprintf(stderr, "Starting Avahi loop search\n");

2099

1692

}

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

2105

(ret == 0) ? "successfully" : "with error");

2106

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2107

1695

2108

1696

end:

2109

1697

2130

1718

if(gpgme_initialized){

2131

1719

gpgme_release(mc.ctx);

2132

1720

}

2133

2134

/* Cleans up the circular linked list of Mandos servers the client

2135

has seen */

2136

if(mc.current_server != NULL){

2137

mc.current_server->prev->next = NULL;

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

/* XXX run network hooks "stop" here */

2146

1721

2147

1722

/* Take down the network interface */

2148

1723

if(take_down_interface){

2150

1725

errno = 0;

2151

1726

ret = seteuid(0);

2152

1727

if(ret == -1){

2153

perror_plus("seteuid");

1728

perror("seteuid");

2154

1729

}

2155

1730

if(geteuid() == 0){

2156

1731

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2157

1732

if(ret == -1){

2158

perror_plus("ioctl SIOCGIFFLAGS");

1733

perror("ioctl SIOCGIFFLAGS");

2159

1734

} else if(network.ifr_flags & IFF_UP) {

2160

1735

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2161

1736

ret = ioctl(sd, SIOCSIFFLAGS, &network);

2162

1737

if(ret == -1){

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2164

1739

}

2165

1740

}

2166

1741

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2167

1742

if(ret == -1){

2168

perror_plus("close");

1743

perror("close");

2169

1744

}

2170

1745

/* Lower privileges permanently */

2171

1746

errno = 0;

2172

1747

ret = setuid(uid);

2173

1748

if(ret == -1){

2174

perror_plus("setuid");

1749

perror("setuid");

2175

1750

}

2176

1751

}

2177

1752

}

2178

1753

2179

/* Removes the GPGME temp directory and all files inside */

1754

/* Removes the temp directory used by GPGME */

2180

1755

if(tempdir_created){

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

int numentries = scandir(tempdir, &direntries, notdotentries,

2184

alphasort);

2185

if (numentries > 0){

2186

for(int i = 0; i < numentries; i++){

2187

direntry = direntries[i];

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

/* Skip "." and ".." */

1770

if(direntry->d_name[0] == '.'

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

2188

1776

char *fullname = NULL;

2189

1777

ret = asprintf(&fullname, "%s/%s", tempdir,

2190

1778

direntry->d_name);

2191

1779

if(ret < 0){

2192

perror_plus("asprintf");

1780

perror("asprintf");

2193

1781

continue;

2194

1782

}

2195

1783

ret = remove(fullname);

2199

1787

}

2200

1788

free(fullname);

2201

1789

}

2202

}

2203

2204

/* need to clean even if 0 because man page doesn't specify */

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1790

closedir(d);

2208

1791

}

2209

1792

ret = rmdir(tempdir);

2210

1793

if(ret == -1 and errno != ENOENT){

2211

perror_plus("rmdir");

1794

perror("rmdir");

2212

1795

}

2213

1796

}

2214

1797

2219

1802

&old_sigterm_action,

2220

1803

NULL));

2221

1804

if(ret == -1){

2222

perror_plus("sigaction");

1805

perror("sigaction");

2223

1806

}

2224

1807

do {

2225

1808

ret = raise(signal_received);

2226

1809

} while(ret != 0 and errno == EINTR);

2227

1810

if(ret != 0){

2228

perror_plus("raise");

1811

perror("raise");

2229

1812

abort();

2230

1813

}

2231

1814

TEMP_FAILURE_RETRY(pause());